.nav-list {
  text-align: center;
  background-color: #d9d9d9;
  position: fixed;
  top: 0;
  width: 100vw;
  height: 70px;
  line-height: 70px;
}

.copyright {
  text-align: center;
  width: 100vw;
  position: fixed;
  bottom: 0;
  background-color: #d9d9d9;
  height: 70px;
  line-height: 70px;
}
